a+b+c =930
0.5 =5/10 =1/2
0.2 =2/10 =1/5
0.(3) =3*9 =1/3
a b c
---- = ---- = ------
1/2 1/5 1/3
a b c
---- +----- + ----- = k
1/2 1/5 1/3
a
--- = k a =k/2
1/2
b
---- = k b =k/5
1/5
c
---- =k c =k/3
1/3
k/2+k/5+k/3 =930 numitor 30
15k+6k+10k =27900
31l =27900
k =900
a=2k =900/2 =450
b =k/5 =900/5 =180
c =k/3 =900/3 =300
v ; 450+180+300 =930